diff --git a/alerting/provider/custom/custom.go b/alerting/provider/custom/custom.go
index 653b76b6..9f7b5736 100644
--- a/alerting/provider/custom/custom.go
+++ b/alerting/provider/custom/custom.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net/http"
+	"os"
 	"strings"
 
 	"github.com/TwinProduction/gatus/client"
@@ -74,6 +75,9 @@ func (provider *AlertProvider) buildHTTPRequest(serviceName, alertDescription st
 
 // Send a request to the alert provider and return the body
 func (provider *AlertProvider) Send(serviceName, alertDescription string, resolved bool) ([]byte, error) {
+	if os.Getenv("MOCK_ALERT_PROVIDER") == "true" {
+		return []byte("{}"), nil
+	}
 	request := provider.buildHTTPRequest(serviceName, alertDescription, resolved)
 	response, err := client.GetHTTPClient(provider.Insecure).Do(request)
 	if err != nil {
diff --git a/watchdog/alerting_test.go b/watchdog/alerting_test.go
index 7510a7b3..cbf051f8 100644
--- a/watchdog/alerting_test.go
+++ b/watchdog/alerting_test.go
@@ -1,15 +1,20 @@
 package watchdog
 
 import (
+	"os"
 	"testing"
 
 	"github.com/TwinProduction/gatus/alerting"
 	"github.com/TwinProduction/gatus/alerting/provider/custom"
+	"github.com/TwinProduction/gatus/alerting/provider/pagerduty"
 	"github.com/TwinProduction/gatus/config"
 	"github.com/TwinProduction/gatus/core"
 )
 
 func TestHandleAlerting(t *testing.T) {
+	_ = os.Setenv("MOCK_ALERT_PROVIDER", "true")
+	defer os.Clearenv()
+
 	cfg := &config.Config{
 		Debug: true,
 		Alerting: &alerting.Config{
@@ -134,6 +139,9 @@ func TestHandleAlerting(t *testing.T) {
 }
 
 func TestHandleAlertingWhenAlertingConfigIsNil(t *testing.T) {
+	_ = os.Setenv("MOCK_ALERT_PROVIDER", "true")
+	defer os.Clearenv()
+
 	cfg := &config.Config{
 		Debug:    true,
 		Alerting: nil,
@@ -143,6 +151,9 @@ func TestHandleAlertingWhenAlertingConfigIsNil(t *testing.T) {
 }
 
 func TestHandleAlertingWithBadAlertProvider(t *testing.T) {
+	_ = os.Setenv("MOCK_ALERT_PROVIDER", "true")
+	defer os.Clearenv()
+
 	cfg := &config.Config{
 		Alerting: &alerting.Config{},
 	}
@@ -195,6 +206,9 @@ func TestHandleAlertingWithBadAlertProvider(t *testing.T) {
 }
 
 func TestHandleAlertingWithoutSendingAlertOnResolve(t *testing.T) {
+	_ = os.Setenv("MOCK_ALERT_PROVIDER", "true")
+	defer os.Clearenv()
+
 	cfg := &config.Config{
 		Alerting: &alerting.Config{},
 	}
@@ -247,6 +261,9 @@ func TestHandleAlertingWithoutSendingAlertOnResolve(t *testing.T) {
 }
 
 func TestHandleAlertingWhenTriggeredAlertIsAlmostResolvedButServiceStartFailingAgain(t *testing.T) {
+	_ = os.Setenv("MOCK_ALERT_PROVIDER", "true")
+	defer os.Clearenv()
+
 	cfg := &config.Config{
 		Debug: true,
 		Alerting: &alerting.Config{
@@ -284,3 +301,54 @@ func TestHandleAlertingWhenTriggeredAlertIsAlmostResolvedButServiceStartFailingA
 		t.Fatal("The alert was already triggered at the beginning of this test")
 	}
 }
+
+func TestHandleAlertingWhenTriggeredAlertIsResolvedPagerDuty(t *testing.T) {
+	_ = os.Setenv("MOCK_ALERT_PROVIDER", "true")
+	defer os.Clearenv()
+
+	cfg := &config.Config{
+		Debug: true,
+		Alerting: &alerting.Config{
+			PagerDuty: &pagerduty.AlertProvider{
+				IntegrationKey: "00000000000000000000000000000000",
+			},
+		},
+	}
+	config.Set(cfg)
+	service := &core.Service{
+		URL: "http://example.com",
+		Alerts: []*core.Alert{
+			{
+				Type:             core.PagerDutyAlert,
+				Enabled:          true,
+				FailureThreshold: 1,
+				SuccessThreshold: 1,
+				SendOnResolved:   true,
+				Triggered:        false,
+			},
+		},
+		NumberOfFailuresInARow: 0,
+	}
+
+	HandleAlerting(service, &core.Result{Success: false})
+	if service.NumberOfFailuresInARow != 1 {
+		t.Fatal("service.NumberOfFailuresInARow should've increased from 0 to 1, got", service.NumberOfFailuresInARow)
+	}
+	if service.NumberOfSuccessesInARow != 0 {
+		t.Fatal("service.NumberOfSuccessesInARow should've stayed at 0, got", service.NumberOfSuccessesInARow)
+	}
+	if !service.Alerts[0].Triggered {
+		t.Fatal("The alert should've been triggered")
+	}
+
+	HandleAlerting(service, &core.Result{Success: true})
+	if service.NumberOfFailuresInARow != 0 {
+		t.Fatal("service.NumberOfFailuresInARow should've decreased from 1 to 0, got", service.NumberOfFailuresInARow)
+	}
+	if service.NumberOfSuccessesInARow != 1 {
+		t.Fatal("service.NumberOfSuccessesInARow should've increased from 0 to 1, got", service.NumberOfSuccessesInARow)
+	}
+	if service.Alerts[0].Triggered {
+		t.Fatal("The alert shouldn't be triggered anymore")
+	}
+}